iris: Handle importing aux-enabled surfaces on TGL

Ensure main surfaces are properly 64KB-aligned (as suggested by Jordan)
and map the main surface addresses to aux surface addresses on import.

v2. Add a Bspec quote. (Sagar)
v3. Add a bit more to the Bspec comment. (Ken)

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> (v2)
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5420>
2 files changed